:root {
  /* Colors - Cloud Dancer & Electric Blue to Emerald */
  --color-bg: #0a0a0a;
  --color-surface: #131313;
  --color-text: #f4f4f4;
  --color-text-secondary: #a0a0a0;
  --color-cloud-dancer: #f4f4f4;
  --color-accent-start: #00d4ff;
  --color-accent-end: #00ff88;
  --color-border: #2a2a2a;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Typography */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Zalando Sans Expanded", sans-serif;
  font-optical-sizing: auto;
  font-weight: var(--font-weight-normal);
  font-style: normal;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 5rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  padding-top: 50px;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  list-style: none;
}

.nav-menu a {
  font-size: 0.95rem;
  font-weight: var(--font-weight-medium);
  opacity: 0.8;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
  opacity: 1;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-start), var(--color-accent-end));
  transition: width var(--transition-normal);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

/* Language Selector */
.lang-selector {
  position: relative;
  display: flex;
  gap: 0.5rem;
  margin-left: var(--spacing-md);
  padding-left: var(--spacing-md);
  border-left: 1px solid var(--color-border);
}

.lang-option {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  color: var(--color-text-secondary);
}

.lang-option:hover {
  border-color: var(--color-accent-start);
  color: var(--color-text);
}

.lang-option.active {
  background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
  border-color: transparent;
  color: var(--color-bg);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, 
    rgba(0, 212, 255, 0.08) 0%, 
    rgba(0, 255, 136, 0.05) 25%,
    transparent 50%);
  animation: pulse 15s ease-in-out infinite;
  pointer-events: none;
}

@keyframes pulse {
  0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.3; }
  50% { transform: scale(1.1) rotate(180deg); opacity: 0.5; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-logo {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.03em;
}

.hero-slogan {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: var(--font-weight-light);
  margin-bottom: var(--spacing-sm);
  color: var(--color-cloud-dancer);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-normal);
}

/* Main Content */
main {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

section {
  padding: var(--spacing-xl) var(--spacing-md);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-text), var(--color-text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  font-weight: var(--font-weight-light);
}

/* About Section */
.about-content {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.1rem;
  line-height: 1.8;
}

.about-content p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

/* Services/Cases Section */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.case-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.case-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-start), var(--color-accent-end));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

.case-card:hover::before {
  transform: scaleX(1);
}

.case-card:hover {
  border-color: var(--color-accent-start);
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 212, 255, 0.1);
}

.case-category {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-accent-start);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.case-card h3 {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.case-description {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.case-benefits {
  list-style: none;
  margin-top: var(--spacing-md);
}

.case-benefits li {
  padding: var(--spacing-sm) 0;
  border-top: 1px solid var(--color-border);
}

.case-benefits li:last-child {
  border-bottom: 1px solid var(--color-border);
}

.benefit-title {
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  margin-bottom: 0.25rem;
  font-size: 0.95rem;
}

.benefit-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Service Visual Examples */
.service-visual {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--color-border);
}

.visual-box {
  background: rgba(0, 212, 255, 0.03);
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 8px;
  padding: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.code-snippet {
  font-family: 'Courier New', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
}

.code-line {
  color: var(--color-text-secondary);
  margin: 0.25rem 0;
}

.code-arrow {
  color: var(--color-accent-start);
  font-size: 1.2rem;
  text-align: center;
  margin: 0.5rem 0;
}

.code-json {
  background: rgba(0, 0, 0, 0.3);
  border-left: 3px solid var(--color-accent-start);
  padding: var(--spacing-sm);
  margin-top: var(--spacing-sm);
  color: #00ff88;
  font-size: 0.8rem;
  overflow-x: auto;
  white-space: pre;
}

/* Assistant Demo Styles */
.assistant-demo {
  background: rgba(0, 255, 136, 0.03);
  border-color: rgba(0, 255, 136, 0.2);
}

.chat-message {
  margin: var(--spacing-sm) 0;
  padding: var(--spacing-sm);
  border-radius: 8px;
  max-width: 90%;
}

.chat-message.user {
  background: rgba(0, 212, 255, 0.1);
  border-left: 3px solid var(--color-accent-start);
  margin-right: auto;
}

.chat-message.ai {
  background: rgba(0, 255, 136, 0.1);
  border-left: 3px solid var(--color-accent-end);
  margin-left: auto;
}

.message-content {
  color: var(--color-text);
  font-size: 0.9rem;
  line-height: 1.5;
}

.chat-message.user .message-content {
  font-weight: var(--font-weight-medium);
}

.visual-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
}

/* Contact Section */
.contact-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-cta {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.contact-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: all var(--transition-normal);
  font-size: 1.1rem;
}

.contact-link:hover {
  border-color: var(--color-accent-start);
  background: rgba(0, 212, 255, 0.05);
  transform: translateX(5px);
}

.contact-label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

.contact-value {
  color: var(--color-text);
}

/* Footer */
footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  margin-top: var(--spacing-xl);
}

footer p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* Utility Classes */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Scroll to top button */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--color-accent-start), var(--color-accent-end));
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-bg);
  font-size: 1.5rem;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  transform: translateY(-5px);
}